package com.xiaolun.netty.protocoltcp;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;

import java.util.List;

public class MyMessageDecoder extends ReplayingDecoder<Void> {
	@Override
	protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
		System.out.println("MyMessageDecoder decode 被调用");
		//需要将得到二进制字节码-> MessageProtocol 数据包(对象)
		int length = in.readInt();
		//根据length获取字节数组
		byte[] content = new byte[length];
		in.readBytes(content);
		//封装成 MessageProtocol 对象，放入 out， 传递下一个handler业务处理
		MessageProtocol messageProtocol = new MessageProtocol();
		messageProtocol.setLen(length);
		//拆包和解包的过程，将读取到的内容放到MessageProtocol对象中
		messageProtocol.setContent(content);
		out.add(messageProtocol);
	}
}
